Herbicides are chemical substances used to control or eliminate unwanted plants, commonly known as weeds. They work by targeting specific biological processes in plants, disrupting their growth and development. Herbicides can be selective, affecting only certain types of plants, or non-selective, killing all vegetation they come into contact with. Farmers and gardeners often use herbicides to improve crop yields and maintain the health of their gardens. However, the use of herbicides can raise environmental concerns, as they may affect non-target plants and wildlife. Proper application and management are essential to minimize potential negative impacts on ecosystems.